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  • Warming and grazing increase mineralization of organic P in an alpine meadow ecosystem of Qinghai-Tibet Plateau, China

    Author(s)
    Rui, Yichao
    Wang, Yanfen
    Chen, Chengrong
    Zhou, Xiaoqi
    Wang, Shiping
    Xu, Zhihong
    Duan, Jichuang
    Kang, Xiaoming
    Lu, Shunbao
    Luo, Caiyun
    Griffith University Author(s)
    Xu, Zhihong
    Chen, Chengrong
    Rui, Yichao
    Zhou, Xiaoqi
    Lu, Shunbao
    Duan, Jichuang
    Year published
    2012
    Metadata
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    Abstract
    Background and aims Little is known about the soil phosphorus (P) biogeochemical cycling in response to combined warming and grazing, especially in the alpine meadow ecosystem of the Qinghai-Tibet Plateau. Here, we used a free-air temperature enhancement system in a controlled warming-grazing experiment to test the hypothesis that combined warming and grazing would significantly accelerate mineralization of soil organic P. Methods A two factorial design of warming (1.2-1.7àtemperature increase) and moderate grazing was utilized. A fractionation method was applied to investigate the sizes of different soil inorganic ...
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    Background and aims Little is known about the soil phosphorus (P) biogeochemical cycling in response to combined warming and grazing, especially in the alpine meadow ecosystem of the Qinghai-Tibet Plateau. Here, we used a free-air temperature enhancement system in a controlled warming-grazing experiment to test the hypothesis that combined warming and grazing would significantly accelerate mineralization of soil organic P. Methods A two factorial design of warming (1.2-1.7àtemperature increase) and moderate grazing was utilized. A fractionation method was applied to investigate the sizes of different soil inorganic and organic P fractions. Results Results showed that both warming and grazing significantly decreased the quantity of organic P extracted by first NaOH (N(I)Po), as well as the total extractable organic P (TPo) at the 0-10 cm depth. Warming also decreased the total P of soil at 0-10 cm. The combined warming and grazing treatment (WG) led to the reduction of major soil organic P fractions (N(I)Po, TPo) by 40-48% and 28-32%, respectively compared with other treatments at 0-10 cm. The activities of acid and alkaline phosphomonoesterase (AcPME and AlPME) were both enhanced by warming and grazing, and their interaction. Decreased concentrations of soil N(I)Po and TPo were accompanied by increased AcPME activity (P?<?0.01) and soil temperature (P?<?0.05), indicating the enhanced mineralization of organic P under rising temperature. Meanwhile, leaf biomass P of two major species (Potentilla anserine and Gentiana straminea) within these plots were significantly enhanced by either grazing or warming. Conclusions The microbial mineralization of soil organic P could be strongly increased under combined warming and grazing conditions as driven by increasing plant demand for P and enhanced microbial activities.
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    Journal Title
    Plant and Soil
    Volume
    357
    Issue
    1-2
    DOI
    https://doi.org/10.1007/s11104-012-1132-8
    Subject
    Soil Biology
    Environmental Sciences
    Biological Sciences
    Agricultural and Veterinary Sciences
    Publication URI
    http://hdl.handle.net/10072/49910
    Collection
    • Journal articles

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